public void ShouldRestartAtFirstInstance()
{
var strategy = new SingleInstanceRoundRobinDistributionStrategy("endpointA", DistributionStrategyScope.Send);
var instances = new[]
{
"1",
"2",
"3"
};
var result = new List<string>();
result.Add(strategy.SelectReceiver(instances));
result.Add(strategy.SelectReceiver(instances));
result.Add(strategy.SelectReceiver(instances));
result.Add(strategy.SelectReceiver(instances));
Assert.That(result.Last(), Is.EqualTo(result.First()));
}
public void WhenInstancesRemoved_ShouldOnlyDistributeAcrossRemainingInstances()
{
var strategy = new SingleInstanceRoundRobinDistributionStrategy("endpointA", DistributionStrategyScope.Send);
var instances = new []
{
"1",
"2",
"3"
};
var result = new List<string>();
result.Add(strategy.SelectReceiver(instances));
result.Add(strategy.SelectReceiver(instances));
instances = instances.Take(2).ToArray(); // remove last instance.
result.Add(strategy.SelectReceiver(instances));
Assert.That(result.Count, Is.EqualTo(3));
Assert.That(result, Has.Exactly(2).EqualTo(instances[0]));
Assert.That(result, Has.Exactly(1).EqualTo(instances[1]));
}
public void WhenNewInstancesAdded_ShouldIncludeAllInstancesInDistribution()
{
var strategy = new SingleInstanceRoundRobinDistributionStrategy("endpointA", DistributionStrategyScope.Send);
var instances = new []
{
"1",
"2",
};
var result = new List<string>();
result.Add(strategy.SelectReceiver(instances));
result.Add(strategy.SelectReceiver(instances));
instances = instances.Concat(new [] { "3" }).ToArray(); // add new instance
result.Add(strategy.SelectReceiver(instances));
Assert.That(result.Count, Is.EqualTo(3));
Assert.That(result, Has.Exactly(1).EqualTo(instances[0]));
Assert.That(result, Has.Exactly(1).EqualTo(instances[1]));
Assert.That(result, Has.Exactly(1).EqualTo(instances[2]));
}
public void ShouldRoundRobinOverAllProvidedInstances()
{
var strategy = new SingleInstanceRoundRobinDistributionStrategy("endpointA", DistributionStrategyScope.Send);
var instances = new[]
{
"1",
"2",
"3"
};
var result = new List<string>();
result.Add(strategy.SelectReceiver(instances));
result.Add(strategy.SelectReceiver(instances));
result.Add(strategy.SelectReceiver(instances));
Assert.That(result.Count, Is.EqualTo(3));
Assert.That(result, Has.Exactly(1).EqualTo(instances[0]));
Assert.That(result, Has.Exactly(1).EqualTo(instances[1]));
Assert.That(result, Has.Exactly(1).EqualTo(instances[2]));
}
